Hubbard, L. Ron, 1911-1986, author
The Way to Happiness Foundation International, 2007
Buku Teks
Vinogradoff, Paul, 1854-1925, author
Oxford University Press, 1970
Buku Teks
Vinogradoff, Paul, 1854-1925, author
Oxford University Press, 1959
Buku Teks
Russell, Bertrand, 1872-1970, author
Routledge, 2001
Buku Teks
Lasker, Emanuel, author
Dover, 1965
Buku Teks